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Q)

To obtain a p-type semiconductor germanium is doped with

$(a)\;Gallium \\ (b)\;Boron \\ (c)\;both\;gallium\;and\; Boron \\ (d)\;Neither\;gallium\;and\; Boron $

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A)
To obtain p-type semiconductor the doping element must be trivalent .
Both Gallium and Boron are trivalent and so can be used to dope Germanium to get p-type semiconductor.
Hence c is the correct answer.
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